Problem:
Where to find an example of two-phase commit?

Solution:
Api13.c in the InterBase Examples directory is a program that performs 
a multi-database transaction with a two-phase commit.

Default path to api13.c for the following InterBase versions are:

Version 4.2 for NT/Win95
-----------------------
Program files/Borland/intrbase/examples/v4



Version 5.x for NT
------------------
Program files/InterBase Corp/InterBase/examples


Version 4.0 for Unix
--------------------
/usr/interbase/examples/v4



Version 5.x for Unix
--------------------
/usr/interbase/examples